carbon-components-angular/utils/window-tools.js

Next generation components

/*!
 *
 * Neutrino v0.0.0 | window-tools.js
 *
 * Copyright 2014, 2018 IBM
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0

 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


var _scrollbarWidth = -1;
export function getScrollbarWidth() {
    // lets not recreate this whole thing every time
    if (_scrollbarWidth >= 0) {
        return _scrollbarWidth;
    }
    // do the calculations the first time
    var outer = document.createElement("div");
    outer.style.visibility = "hidden";
    outer.style.width = "100px";
    outer.style.msOverflowStyle = "scrollbar"; // needed for WinJS apps
    document.body.appendChild(outer);
    var widthNoScroll = outer.offsetWidth;
    // force scrollbars
    outer.style.overflow = "scroll";
    // add innerdiv
    var inner = document.createElement("div");
    inner.style.width = "100%";
    outer.appendChild(inner);
    var widthWithScroll = inner.offsetWidth;
    // remove divs
    outer.parentNode.removeChild(outer);
    _scrollbarWidth = widthNoScroll - widthWithScroll;
    return _scrollbarWidth;
}
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